Improvement in hinges for school-desks



I iniifflwi ALBE RT. ROBERTS,

` I, ALBERT E. ROBERTS, of' Des Moines, in the county of Polk and State of Iowa, have invented certain Improvements in the Construction of my 'School- Desk, (patent-s No. `93,307anil No.`98,801,). ofivhi'eh the `following isa specification."

My invention is `an improvement of my school-desk patented August 17, 1869, andJanuary 11, 1870, and

nndto provide a means of regulating the frction'- of the'joints. l i t It consists of a projection, on'thesidc of the joint, v in the forinof. acateh, and amovablecover toiit in i the catch, fin such a manner that the cover. will receive, conceal, and protect the endof the screw-bolt.. Figurel is aperspective -vew of my vschooldesk, l showing the top of thedeskdivided into three parts or sections. 1 i a (t is the center section, andis permanently hinged, as represented. `W'henin its place, as represented in i the drawing, itmakes. the topof' 'thef desk complete, and holds the suspended or pivoted` `part of the desk,

`for use. v By turning the hinged .center` section a a upward, itii'ees the book-box and suspended desk, so that they mayrh'e Vreadily moved and folded` forward as desired.

the hookehox, and also a guard to prevent the booklbox from striking'the hack ofthe seat. 'Y

support the seat of `my school-desk. c c is a projection, inthe forrnofa catch orsocket,

. joined to the frame and hinge. `This projection or l )socket is cast vsolid with the frame, and made a part thereof.

d :l is a movable cover, made of cast metal, and'has isdesigned to strengthen the hinge-joiuts used 'in s usl' pending the seat and the revolving book-boxandvdesk together with the bookbo.\',sec1`1relyin position `ready b b is a' projection in the frame, forming a rest `for `Figure 2 is a perspectiveview of my hinge, used to V,anend shaped to fit the socket c c. yWhen in its @anni *Gtjijli-w.

or Das MOINES, IOWA.

`I .taem Patent' No. 107,724, dated september 27, 1870.

. IMPRVEMENT IN HINGE-S` `FOR SCHQOL-DESKS.

The' `Schedule referred to in these Letters Patent and making part the same with the same effect and for The same purpose on' all l hinge-joints.

Figure 3 is a halt section of myhinge, used for suspending the combined book-box and desk.'

f f is the male part ofthe hinge. g g is the female part of the same hinge. h/isaconical-shaped cavity in the frameor hinge, by the use ofnr'hich l avoidthe drilling oi' a hole for the bolt, and form a cavity to receive the head ofthe bolt.

These saine improvements are applied and used in my hinges I supporting the seat of my desk, but are not shown in the drawing in fig. 2.

I am aware that there is nothing new in the construction of` this socket-hinge,.excepting in Ythe man1 ner of using it,and applying it to form a joint or hinge in the frameoffinyschool-desk.

I claim as my invention- .lhe'addition ofthe projection and socketcc to the frameand hinge, together with the movable cover d d, substantially as described, and for the purposes speci- ALBERT E. ROBERTS.' Witnesses: A i

OoRYDoN E. FULLER, ALBERT W. C. WEEKS. 

